On the campaign trail, now-president Donald Trump vowed to "cancel" the 196-nation pact to rein in global warming by curbing emissions from burning oil, coal and gas.

World Bulletin / News Desk

After frustrating talks in Bonn with an American delegation in limbo, UN climate negotiators are pinning their hopes for the Paris Agreement's future on diplomatic arm-twisting at the highest level.

He has not yet executed his threat, but Trump has made it clear where he stands.

His secretary of state was a CEO of oil giant ExxonMobil, and the Environmental Protection Agency head an anti-climate litigator. Trump has moved to slash EPA funding, and to loosen restrictions on coal-fired power plants and vehicle emissions.

Now the man who has called climate change a "hoax" perpetrated by China, is scheduled to rub shoulders with some of the world's most influential leaders in a duo of high-stakes huddles.

The first is a May 26-27 summit in Sicily of the G7 rich nations, followed on July 7-8 by a meeting in Hamburg of the G20 major economies, of which the G7 also forms part.

Key members of both groupings have already called on Trump to stay the climate course.

"If Donald Trump is unclear on the lethal implications of his muddled climate policy then it’s up to the other leaders of the G7 to ensure he is aware of just how damaging his actions can be," said Mohamed Adow, an analyst with Christian Aid, which advocates for poor country interests at the UN climate forum.

"They must make a strong case for action when they meet."

At the G7 meeting, Trump will talk with his peers from Germany, Canada, France, Britain, Italy and Japan.